/*
 * BEEM is a videoconference application on the Android Platform.
 * Copyright (C) 2009 by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * This file is part of BEEM.
 * BEEM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * BEEM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with BEEM. If not, see <http://www.gnu.org/licenses/>.
 * Please send bug reports with examples or suggestions to
 * contact@beem-project.com or http://dev.beem-project.com/
 * Epitech, hereby disclaims all copyright interest in the program "Beem"
 * written by Frederic-Charles Barthelery,
 * Jean-Manuel Da Silva,
 * Nikita Kozlov,
 * Philippe Lago,
 * Jean Baptiste Vergely,
 * Vincent Veronis.
 * Nicolas Sadirac, November 26, 2009
 * President of Epitech.
 * Flavien Astraud, November 26, 2009
 * Head of the EIP Laboratory.
 */
package com.beem.project.beem.smack.pep;

import java.util.ArrayList;
import java.util.List;

import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.pubsub.EventElement;
import org.jivesoftware.smackx.pubsub.EventElementType;
import org.jivesoftware.smackx.pubsub.Item;
import org.jivesoftware.smackx.pubsub.ItemsExtension;
import org.jivesoftware.smackx.pubsub.PubSubManager;
import org.jivesoftware.smackx.pubsub.LeafNode;

/**
 * Little extension of {@link PubSubManager} which allows to add {@link PEPListener}.
 */
public class PepSubManager extends PubSubManager {

	private List<PEPListener> mPepListeners = new ArrayList<PEPListener>();
	private PacketFilter mPacketFilter = new PacketExtensionFilter("event", "http://jabber.org/protocol/pubsub#event");

	/**
	 * Create a PepSubManager.
	 *
	 * @param connection
	 *            the connection
	 */
	public PepSubManager(final Connection connection) {
		super(connection);
		init(connection);
	}

	/**
	 * Create a PepSubManager associated to the specified connection where the pubsub
	 * requests require a specific to address for packets.
	 *
	 * @param connection
	 *            the connection
	 * @param toAddress
	 *            The pubsub specific to address (required for some servers)
	 */
	public PepSubManager(final Connection connection, final String toAddress) {
		super(connection, toAddress);
		init(connection);
	}

	/**
	 * Add a listener to PEP event.
	 *
	 * @param listener
	 *            the listener
	 */
	public void addPEPListener(PEPListener listener) {
		if (!mPepListeners.contains(listener)) mPepListeners.add(listener);
	}

	/**
	 * Remove a listener to PEP event.
	 *
	 * @param listener
	 *            the listener
	 */
	public void removePEPListener(PEPListener listener) {
		mPepListeners.remove(listener);
	}

	/**
	 * Get a PepNode.
	 * This node is obtain without checking its existence as PEP should auto create it.
	 *
	 * @param nodeName
	 *            the node name
	 * @return the node
	 */
	public LeafNode getPEPNode(String nodeName) {
		LeafNode node = new LeafNode(con, nodeName);
		node.setTo(to);
		return node;
	}

	/**
	 * Initialize the PepSubManager.
	 *
	 * @param con
	 *            the connection
	 */
	private void init(Connection con) {
		PacketListener packetListener = new PacketListener() {

			@Override
			public void processPacket(Packet packet) {
				EventElement e = (EventElement) packet.getExtension("event", "http://jabber.org/protocol/pubsub#event");
				if (e.getEventType() != EventElementType.items) return;
				ItemsExtension it = (ItemsExtension) e.getEvent();
				if (it.getItemsElementType() != ItemsExtension.ItemsElementType.items) return;
				List<Item> items = (List<Item>) it.getItems();
				firePEPListeners(packet.getFrom(), it.getNode(), items);
			}
		};
		con.addPacketListener(packetListener, mPacketFilter);
	}

	/**
	 * Fire the PEP listeners.
	 *
	 * @param from
	 *            the JID of the user who send the event
	 * @param node
	 *            the node of the items in the event
	 * @param items
	 *            the different items of the event
	 */
	private void firePEPListeners(String from, String node, List<Item> items) {
		for (PEPListener listener : mPepListeners) {
			listener.eventReceived(from, node, items);
		}
	}
}
